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$ cargo run
Compiling unsafe-example v0.1.0 (file:///projects/unsafe-example)
error[E0499]: cannot borrow `*values` as mutable more than once at a time
--> src/main.rs:6:31
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1 | fn split_at_mut(values: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
| - let's call the lifetime of this reference `'1`
...
6 | (&mut values[..mid], &mut values[mid..])
| --------------------------^^^^^^--------
| | | |
| | | second mutable borrow occurs here
| | first mutable borrow occurs here
| returning this value requires that `*values` is borrowed for `'1`
For more information about this error, try `rustc --explain E0499`.
error: could not compile `unsafe-example` due to previous error
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